Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




Diagnostic trouble code (DTC)ECM- 200A is stored if the engine control module (ECM) registers that the engine coolant temperature (ECT) does not increase a certain number of degrees (depending on outer temperature within a certain time of starting.

Substitute value
- if the temperature sensor in the mass air flow (MAF) sensor is OK it is used as the start temperature. Otherwise the value is set at +20°C (68°F)
- after starting the engine coolant temperature (ECT) is calculated theoretically
- engine cooling fan (FC) at low-speed.

Possible source

Faulty signal
- contact resistance in connector
- defective thermostat
- defective engine coolant temperature (ECT) sensor.

Fault symptom[s]
- difficult to start when cold
- driveability problems during warm-up cycle
- engine cooling fan (FC) operates constantly.